XCD-109 Snapping change of a measurement in progress

[MichalDybizbanskiCreoox]

This PR changes semantics of the {Angle,Distance}Measurements{Mouse,Touch}Control::snapping change while a measurement is partially created. Specifically the PR prevents resetting the creation process on snapping change, which means that snapping change will keep a partial measurement intact. This allows some of a measurement's endpoints to be places with snapping, and some without.

This PR also fixes the XEOK-46 regression.